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Dave9n3
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« Reply #19 on: July 03, 2026, 03:39:00 AM »
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Hi,
is anyone else interested in trying to figure out a way to make this work?
I'm revisiting my project and have begun emulating signals to the gearbox. I'm emulating these, maybe not all required but the TCU now sends a ZG request to the engine to action.
ZG EMUL — 0x280 CAN A→B:
D2 miistc — actual indicated torque %, rises 80ms, holds 120ms, decays 80ms, peak = 0.047×RPM+4Nm
D5 mifab — base torque, peak = miistc×0.55
D8 mivbeg — driver demand torque, peak = miistc×0.85
D1 bit6 B_stgek — ECU-TCU coordination active, set +12ms after paddle trigger
ZG EMUL — 0x380 CAN A→B:
D8 wdkba_TCU — throttle angle for MED9.1 TCU, D3 permanently mirrored + ZG blip on top
MOMINTEREST — 0x488 CAN A→B:
D4 — config byte forced constant 0x7C
D5 — config byte forced constant 0xA6
D6 mominterest — motor intervention availability 0xFF=100%, profile-controlled ramp during overrun ZG shift
D7 bz_mot6 — OBD multiplex: code 0=load, 1=throttle, 2=coolant 85°C, 3=abs load, 4=pedal, 5-15=0xFF
D8 — dual nibble counter, high nibble 0-F, low nibble alternates 0x0/0x4
the result of this emulation so far is rather than a delay from paddle press to a lethargic shub shift maybe 1s after with a slow ramp up I now have an immediate clutch drop, engine speed drops before ending ultimately in a schub shift.
with the emulation to the gearbox, it now sends me 0x540 D1 bit3 — B_zges high rather than never sending as it did before emulation. I have noticed that if i press for a downshift then quickly stab the throttle, the shift completes quite quickly, if i don't add tht throttle it continues to the schub shift after a delay.
if we assume I have to keep my emulator between main canbus and the TCU, is there any easier way to add a throttle blip % versus engine rpm for the duration that the pin is high or pulled low. just thinking out loud.
is there a more rudimentry way this emulation can be added to the calibration, rather than implementing the full VAG strategy. I don't think i yet have the skills for this hence asking here.
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